Usman Saleem asked . 2022-01-12

How to process NC file in matlab

I've monthly soil monisture NC file. This file contains monthly soil monisture data since 1948. I want to extract soil data within my shapefile in text file (Shapefile has also attached). I google alot to proccess NetCDF file in matlab find not solution, The ncdisp of my nc file is given below:

Format:
           netcdf4_classic
Global Attributes:
           _NCProperties = 'version=1|netcdflibversion=4.4.1.1|hdf5libversion=1.10.1'
           Conventions   = 'CF-1.0'
           title         = 'CPC Soil Moisture'
           institution   = 'NOAA/ESRL PSD'
           dataset_title = 'CPC Soil Moisture'
           history       = 'Wed Oct 18 15:13:37 2017: ncks -d time,,-2 soilw.mon.mean.x.nc soilw.mon.mean.xx.nc
                           Wed Oct 18 15:12:08 2017: ncks -d time,,-3 soilw.mon.mean.nc soilw.mon.mean.x.nc
                           CPC Soil Moisture
                            Obtained on Nov 2004 from CPC's website
                            and written to netCDF by Cathy Smith 12/2004.
                            he CPC Global monthly soil moisture dataset is a 1/2 degree resolution grid from 1948 to the present.
                            The file is written in COARDS and CF compliant netCDF at NOAA ESRL/PSD https://www.esrl.noaa.gov/psd/ 
                            Converted to chunked, deflated non-packed NetCDF4 Jul 2014'
           NCO           = '4.6.9'
           References    = 'https://www.psl.noaa.gov/data/gridded/data.cpcsoil.html'
Dimensions:
           lat  = 360
           lon  = 720
           time = 886   (UNLIMITED)
Variables:
    lat  
           Size:       360x1
           Dimensions: lat
           Datatype:   single
           Attributes:
                       long_name          = 'Latitude'
                       units              = 'degrees_north'
                       actual_range       = [8.98e+01 -8.98e+01]
                       standard_name      = 'latitude'
                       axis               = 'Y'
                       coordinate_defines = 'point'
    lon  
           Size:       720x1
           Dimensions: lon
           Datatype:   single
           Attributes:
                       long_name          = 'Longitude'
                       units              = 'degrees_east'
                       actual_range       = [2.50e-01 3.60e+02]
                       standard_name      = 'longitude'
                       axis               = 'X'
                       coordinate_defines = 'point'
    soilw
           Size:       720x360x886
           Dimensions: lon,lat,time
           Datatype:   single
           Attributes:
                       long_name     = 'Model-Calculated Monthly Mean Soil Moisture'
                       missing_value = -9.97e+36
                       units         = 'mm'
                       valid_range   = [0.00e+00 1.00e+03]
                       dataset       = 'CPC Monthly Soil Moisture'
                       var_desc      = 'Soil Moisture'
                       level_desc    = 'Surface'
                       statistic     = 'Monthly Mean'
                       parent_stat   = 'Other'
                       standard_name = 'lwe_thickness_of_soil_moisture_content'
                       cell_methods  = 'time: mean (monthly from values)'
                       actual_range  = [0.00e+00 1.00e+30]
    time 
           Size:       886x1
           Dimensions: time
           Datatype:   double
           Attributes:
                       long_name          = 'Time'
                       units              = 'days since 1800-01-01 00:00:0.0'
                       delta_t            = '0000-01-00 00:00:00'
                       avg_period         = '0000-01-00 00:00:00'
                       standard_name      = 'time'
                       axis               = 'T'
                       bounds             = 'time_bnds'
                       coordinate_defines = 'start'
                       prev_avg_period    = '0000-00-01 00:00:00'
                       actual_range       = [5.41e+04 8.10e+04]

I've tied

  
  file='data.nc';
ncdisp(file)
long = ncread(file,'lon');
latt = ncread(file,'lat');
time = ncread(file,'time');

I want output of Soilw in this format in text file

Date        Soilw
01/01/2015   10
01/02/2015    20
01/03/2015    0.5

Please help me to convert monthly netcdf datainto text file using matlab please?

matlab gui , image processing , image analysis , netcdf

Expert Answer

Kshitij Singh answered . 2024-12-21 00:27:03

file = 'data.nc';
shapefile = 'lahore.shp';
long = ncread(file, 'lon');
latt = ncread(file, 'lat');
time = ncread(file, 'time');
soilw = ncread(file, 'soilw');
S = shaperead(shapefile);

%ncread sometimes returns the transpose of what we expect
if size(soilw, 1) ~= length(lat)
  soilw = permute(soilw, [2 1 3]);
end

Ntime = length(time);
Date = datetime('1800-01-01 00:00:00') + days(time(:));

mask = inpolygon(lat, lon, S.Y, S.X);  %caution, lat is Y not X !
Soilw = zeros(Ntime, 1);

for K = 1 : Ntime
  sl = soilw(:,:,K);
  Soilw(K) = mean( sl(mask) );
end

output = table(Date, Soilw);

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